Tried it and well here it is.
I went into SP breathing was like in automatic mode lost feeling in most of my limbs and chest and face felt wierd in a heavy sort a way.
I started feeling the gerting pulled down but i remained calm. I started seeing flashes and hipnogogic images, rem like eye movement etc. Point is i could eneter a dream since its like not there i completely emptied my mind relaxed to max extent and nothing.

So after 50min i opened my eyelids sarted trying to move til i went out of sp. Went to drink water and back to bed to sleep. Guess what my body went into sp like in 3 min but i wasnt asleep!! I didnt even try and now i couldnt sleep cuz i felt a bit wierd about beeing in sp and not beeing asleep.

So i moved switched position and boom sp in like 1-2min of lying still with eyes open so after prob 1-2 hrs of this i finally fell a sleep.

Conclusion dont do wild wothout a wbtb unless you wana get used to sp. After wut happened to me (expirienced going into sp prob like 8 times) im more prepared for normal wbtb wilding since i know how it feels and i wont get stressed or anything so it wasnt all bad.